Description
Primary hydraulic pressure on the 20-ton Caterpillar 320C excavator is produced by an engine-mounted tandem variable axial piston pump directly driven by the Cat 3066T diesel engine. Tatan Machinery stocks and supplies 100% Brand New SBS80 hydraulic main pump assemblies (OEM reference: 172-5638 / 190-7853, interchangeable with 244-1709 / 206-3300). Pre-assembled with dual negative flow control regulators and an integrated auxiliary pilot pump, every complete unit is factory dynamometer-tested under full 34.3 MPa relief surge pressure and backed by our 12-Month Comprehensive Replacement Warranty.
Source Verification: First-Party Physical Stockholding
We are a specialized stocking supplier of excavator hydraulic components. We do not dropship unverified goods. All hydraulic pumps, control valves, and final drives supplied on our site are 100% Brand New (our diesel engine assemblies are remanufactured to OEM tolerances).
| Supplying Entity: | Tatan Machinery (Excavator Component Exporter) |
| Component Classification: | Hydraulic Pump Assembly / Hydraulic Parts |
| Hydraulic Pump Core: | SBS80 Tandem Swashplate Axial Piston Pump |
| OEM Master Assembly Code: | 172-5638 / 190-7853 (Cross Ref: 244-1709, 206-3300, 161-0082) |
| Manufacturing Standard: | 100% Factory Brand New (Unused, Full Dyno Pressure Certified) |
| Target Machine Brand: | Caterpillar Excavator Parts Collection |
📦 Heavy Pump Inventory & Staging Verification
Physical stock ready for crating, port blanking inspection, and serial tag verification:
Physical inventory verified — no broker middleman. Live photos of serial number tags provided upon inquiry.
Hydraulic & Mechanical Fitment Specifications
| Engineering Property | Design Metric |
|---|---|
| Pump Construction | Tandem Swashplate Variable Axial Piston Pump (Front Pump + Rear Pump) |
| Displacement per Section | 2 × 80 cc/rev (160 cc total displacement) |
| Rated Operating Pressure | 34.3 MPa (350 bar / 4,978 PSI) Heavy Digging Circuit Threshold |
| Maximum Output Flow Rate | 2 × 205 L/min (410 L/min total flow delivery at rated RPM) |
| Input Drive Spline | Involute Spline Shaft matched for Cat 3066T Flywheel Coupling |
| Flow Regulation Control | Dual Negative Flow Control (NFC) with Proportional Solenoid Modulation |
| Dry Assembly Weight | Approx. 135 kg (297 lbs) Complete Pump with Regulators |
| Standard Machine Match | Caterpillar 320C, 320C L, 320C LN (20-Ton Excavators) |
Field Reality: Why Rebuilding Worn CAT 320C Pumps Fails
The CAT 320C is one of the hardest-working 20-ton excavators ever made. When the hydraulic pump begins to fail, on-site overhauls with individual rotary parts frequently lead to repeated breakdowns:
- Swashplate Cradle Bearing Scoring & Engine Bogging: Operating under contaminated oil ruins the cradle bearings supporting the pump swashplates. The swashplates bind, preventing the pump from destroking when hydraulic pressure spikes, bogging down or stalling the Cat 3066T engine.
- Barrel-to-Valve Plate Thermal Distortion: High-pressure friction warps the mating face between the rotating cylinder block and the bi-metallic valve plate. Micro-bypass leakage dumps extreme heat directly into the case-drain line, elevating hydraulic tank temperatures past 90°C.
- Risk of Catastrophic Contamination into 172-5636 Control Valve: Piston shoe separation releases pulverized brass and steel shavings into the high-pressure steel hardlines, permanently seizing the spools in the expensive main control valve.
- Overhaul Downtime vs. Complete Drop-in: Sourcing individual parts, line-boring pump casings, and calibrating dual NFC regulators on-site takes weeks. Installing a 100% Brand New drop-in assembly gets a 20-ton revenue-generating excavator back to work in 1 working day.
Factory Dyno Testing & 12-Month Component Warranty
To guarantee factory breakout force and cycle speed overseas, every 172-5638 hydraulic pump is bench-tested on our automated digital dynamometer before export packaging:
- Full Working Relief Hold Test: Main circuits loaded to 34.3 MPa (350 bar) continuous pressure and relief surges to verify casting integrity and swashplate structural rigidity.
- Volumetric Flow & Dual-Pump Balance Test: Synchronizing flow curves between Front Pump and Rear Pump across all swash angles to ensure straight-line tracking without drift.
- Case-Drain Internal Slippage Rate: Precision flow-meter measurement at working oil temperature (55°C) to certify volumetric efficiency exceeds 93% with minimal case leakage.
- Regulator De-Stroke Response Calibration: Calibrating the pilot regulators and proportional valves to factory Caterpillar electronic governor modulation.
📹 Workshop Main Pump Dyno Testing Live Clip
Watch our technician inspect pressure output, dual regulators, and shaft splines:
✓ Live unit filmed on hydraulic test stand at Tatan Machinery facility
Export Packing & Logistics Dispatch
A heavy 135 kg hydraulic pump requires clinical protection against airborne moisture and rough ocean container transit:
- Solid Steel Port Blanking: Main suction 4-bolt SAE flange and dual high-pressure outlets sealed with heavy-duty metal blanking plates and O-ring plugs.
- VCI Vapor-Phase Anti-Rust Foil: Input drive splines and unpainted mounting flanges treated with marine anti-corrosion grease and hermetically sealed.
- Heavy Internal Structural Base Bolting: The pump is anchored through its mounting flange into heavy timber base skids inside an ISPM 15 solid export wooden crate.
- Prompt Global Shipping: Air express via DHL/FedEx (3–7 days) for machine-down emergencies, or consolidated sea freight (LCL/FCL) with complete HS Code (8413.60) paperwork.
Sealed steel port plates, protective anti-corrosion wax, and reinforced wooden crating
Field Commissioning Rules: Protect Your New Main Pump
To protect your 12-month warranty, technicians MUST adhere to these critical procedures during installation:
- MANDATORY: Pre-Fill Pump Casing via Top Case Drain Port: Before cranking the engine, remove the top case-drain plug and pour clean ISO VG 46 hydraulic oil directly into the pump casing until full. Starting a dry axial piston pump will gall the brass slipper shoes and valve plate in under 5 seconds!
- Flush Hydraulic Tank & Replace Return Elements: If the old pump suffered bearing disintegration, metal debris is lining the tank bottom. You MUST drain the oil, wipe the tank floor clean with lint-free towels, and install brand-new suction strainers and return filter cartridges!
- Inspect Flywheel Drive Coupling: Inspect the rubber drive coupling connecting to the Cat 3066T flywheel. If the rubber is hardened or missing teeth, replace it to avoid side-loading the pump shaft.
- De-Aerate and Run at Low-Idle for 15 Minutes: Crank the engine with the fuel solenoid disconnected to circulate oil. Then start and run at low idle (800 RPM) for 15 minutes without touching joysticks to allow all trapped air to vent back to tank.
Procurement Decision FAQ: What Buyers Ask
Q: Is this SBS80 pump brand new or remanufactured? Does it include the regulators?
A: This SBS80 hydraulic pump is 100% Brand New with zero operating hours. It comes completely assembled with brand-new dual hydraulic regulators, proportional valves, and the integrated rear pilot pump. It is a complete drop-in replacement ready for immediate installation.
Q: Are your hydraulic components brand new? Why are your engines remanufactured?
A: Every hydraulic pump, main control valve, travel motor, and swing motor on our site is 100% Brand New. Only our heavy diesel engine assemblies on this site are professionally remanufactured with brand-new internal wear components. You can order with absolute confidence in factory-new metallurgical reliability.
Q: My CAT 320C has part number 190-7853 or 244-1709. Is this completely interchangeable?
A: Yes. 172-5638, 190-7853, and 244-1709 are directly interchangeable Caterpillar OEM part numbers used across 320C and 320C L production batches (prefixes AMC, ANH, BCK, BPR, RAW). Send your machine’s 17-digit PIN number from the cab tag and clear photos of your current pump nameplate to Gavin. We cross-verify the exact pump arrangement code in the official Caterpillar parts database within 10 minutes.
Q: Can I see live test bench video and stamped serial numbers of the actual pump before dispatch?
A: Absolutely yes. Prior to balance payment and dispatch, we send clear photos and live video of the exact unit assigned to your order. You will see the stamped serial tag, input spline teeth, sealed steel port plates, and the wooden box packaging process.
Q: What happens if the pump crate is damaged during sea freight, and what customs documentation is supplied?
A: Every shipment from Tatan Machinery is protected by full commercial marine cargo insurance. The pump is bolted down directly onto internal skids within a fumigation-free solid plywood crate. We supply commercial invoices with accurate HS Codes (8413.60), detailed packing lists, and Certificates of Origin for smooth customs clearance at your destination port.
🔗 Frequently Purchased Together with CAT 320C Hydraulic Main Pump:
- DIESEL ENGINE:
Caterpillar 320C 3066T Diesel Engine Assembly (172-5184)
Remanufactured - MAIN VALVE:
Main Control Valve Assembly (172-5636) for Caterpillar 320C
100% Brand New - SWING MOTOR:
M2X150 Swing Motor Assembly for Caterpillar 320C
100% Brand New - FINAL DRIVE:
Final Drive Travel Motor Assembly for Caterpillar 320C
100% Brand New - BRAND CATALOG:
View All Caterpillar Excavator & Heavy Equipment Parts Collection
Get Wholesale Factory Quote for CAT 320C Pump 172-5638
Looking for direct factory pricing, stock availability, or 12-month warranty terms for Cat 320C main pumps? Contact senior specialist Gavin now!
💡 Fast Quote: Send your machine serial number or current pump photos for an accurate match within 10 minutes!
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote based on freight destination and configuration.
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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